US2156970A - Grinding machine - Google Patents
Grinding machine Download PDFInfo
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- US2156970A US2156970A US151885A US15188537A US2156970A US 2156970 A US2156970 A US 2156970A US 151885 A US151885 A US 151885A US 15188537 A US15188537 A US 15188537A US 2156970 A US2156970 A US 2156970A
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- movement
- arm
- grinding
- reversing
- crossfeed
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- 230000007246 mechanism Effects 0.000 description 59
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/02—Drives or gearings; Equipment therefor for performing a reciprocating movement of carriages or work- tables
- B24B47/06—Drives or gearings; Equipment therefor for performing a reciprocating movement of carriages or work- tables by liquid or gas pressure only
Definitions
- the present invention relates to a. grinding machine for the successive reduction of a plurality of workpieces all to a predetermined size, and is particularly applicable to machines for grinding the internal surfaces of sleeves, bushings and like articles.
- the progress of the grinding operation is selectively under the control of the cross-feed mechanism or under the control of gages which successively enter the bore of the workpiece as the latter approaches and reaches the desired size.
- the grinding operation is under the control of the cross-feed mechanism an axial separation between the grinding wheel and a workpiece in the work-supporting .tructure is provided prior to completion of the grinding operation, during which axial separation the grinding wheel is dressed.
- the dressing tool which is normally in an inoperative position, is moved downwardly, preferably by fluid under pressure, into alinement with the periphery of the grinding wheel, the movement of the tool occurring during the extended movement of the table which procures the relative axial movement between the grinding wheel and workpiece.
- the crossfeed mechanism is also frequently used for controlling other machine movements, such as a back-off of the wheel relative to the workpiece prior to the withdrawal of the wheel from within the workpiece core at the completion of the grinding operation.
- the crossfeed mechanism is actuated by a cam which is mounted on the reciprocatory table and is ad justed to engage with a roller forming part of the crossfeed mechanism so that the roller is rocked during each reciprocation of the table.
- the cam and roller arrangement provides for a step-by-step crossfeed movement of the grinding wheel relative to the workpiece and this step-bystcp advance may occur at any point of the table travel during the normal reciprocation thereof.
- the cam is preferably adjusted on the table so that the step-by-step advance of the wheel may occur at one end of the normal reciprocatory movement of the table, but this adjustment frequently carelessly made so that the step-by-step advance does not occur at the desired point. Since the.
- control mechanism which procures a runout of the table, either for the dressing operation during the grinding operation, or for a final separation between the wheel and the workpiece at the completion of the grinding, is actuated by the crossfeed mechanism, it would be apparent that the control mechanism is set in operation substantially at the same time that the cam on the table engages with the roller during one of the table reciprocations.
- the control mechanism may thus be actuated at any point in the normal reciprocation of the table, dependent upon the position 10 of the table at the time that the feed cam engages and shifts the roller by which the crossfeed mechanism is actuated.
- the downward movement of the dressing tool is controlled by a cam on the machine which is located in a position to engage with a roller carried by the dressing tool support, thereby causing the dressing tool to move smoothly into 20 operative position.
- This cam which controls the dressing tool movement, also cooperates with the roller in returning the dressing tool support to inoperative position when the grinding wheel and work- 2 piece are returned to operative position, and is thus movable relative to the dressing tool support.
- the cam is carried by the base of the machine. The cam is 3 thus in a position to cooperate with the roller if the dressing tool begins its downward movement while the wheel is still within the bore of the workpiece.
- the roller on the dressing tool support cannot engage with the cam since the latter is already longitudinally spaced therefrom.
- the dressing 49 tool is thus moved rapidly down into operative position, where it is suddenly brought to rest, with the result that the machine or the tool is jarred and the tool is not properly located.
- the sudden stopping of the swinging tool the L5 latter does not always remain in its lowermost position and thus does not produce a smooth periphery on the grinding wheel.
- This inaccuracy is particularly objectionable when the workpieces must be ground to very close tolerances.
- One of the principal objects of the present invention is to avoid the above noted objection by having the dressing tool always guided into operative position by the cam which cooperates with the dressing tool structure and which sub- 55 sequently moves the dressing tool upwardly into inoperative position.
- this back-off may occur at any point in the normal reciprocation of the table. If the back-off occurs when the wheel is at the inner end of the workpiece the wheel is backed away from the work while substantially, the entire length of the wheel is in contact with the workpiece surface and no damage is done to the wheel or work. On the other hand, if the backofi. is initiated at a time when the wheel is adjacent to the outer end of the workpiece, the wheel is not always backed away until the axial separation between the wheel and the workpiece has carried the wheel to such a position that only a relatively small portion of the entire length of the wheel is in engagement with the workpiece surface.
- the present invention involves the provision of a structure which, in association with the crossfeed mechanism, will set the control mechanism in operation at the end of the table reciprocation when the wheel is at the inner end of the workpiece.
- the control mechanism may be actuated by the crossfeed mechanism in the desired manner, but a suitable interconnection between the control mechanism and the table reversing mechanism assures that the control mechanism will function at one end of the table stroke.
- the machine is so arranged that the mechanism which procures the runout of the table for the dressing operation is set in motion when the grinding wheel is at the inner end of the workpiece.
- the dressing tool is moved downwardly and engages with the cam when the wheel begins its, withdrawal movement relative to the worksupport.
- FIG. 1 is a front elevation of the mchine embodying the invention.
- Fig. 2 is a front elevation on a larger scale of the mechanism within the control box and a portion of the crossfeed mechanism, parts broken away to show the construction more fully.
- Fig. 3 is an elevation of a portion of the mechanism of Fig. 2 before the beginning of thedressln operation.
- Fig. 4 is a view corresponding to Fig. 3, showing the position of the parts at the beginning of the dressing operation.
- Fig. 5 is a fluid pressure diagram.
- Fig. 6 is a front elevation corresponding to Fig. 2, showing a modified type of grinding machine to which the present invention is applied.
- Fig. '7 is a sectional view along the line of Fig. 6.
- Fig. 8 is a sectional view alongthe line 8-8 -of Fig. 7.
- Fig. 9 is a fluid pressure diagram for the machine of Fig. 6.
- the machine has the usual reciprocatory table I provided in an internal grinding machine. Either the grinding wheel or the work to be ground is carried on said table, the reciproacticns of the latter operating in either case to procure a relative reciprocatory movement between said grinding wheel and the workpiece.
- the table supports and carries a workhead 2 and a wheelhead 3 is mounted on abridge 4 which spans the guideways, not shown, provided by the base 5 of the machine for the movements of the table I.
- the grinding wheel 6 is carried on a spindle 'I journaled in the wheelhead 3, and the workpiece not shown is mounted in a suitable work-supporting member in the form of a chuck .8 carried on the end of a spindle 9 journaled in the workhead.
- Both the grinding wheel and the workpiece are positively rotated as from a driving motor III mounted on the base of the machine.
- the drive shaft of said motor carries a large diameter pulley ll connected by a belt I2 to a pulley l3 on a countershaft l4 journaled within the base.
- a second pulley IS on the countershaft I4- is connected by a belt IE to a small diameter pulley IT on the grinding wheel spindle 1, thereby driving the grinding wheel at a high rate of speed.
- the drive shaft of the motor is also connected to a drum l8 journaled within the base of the machine and connected by a belt H! to a pulley 2
- the arrangement of belts and pulleys preferably provides for a rotation of the grinding wheel at a much higher rate of speed than that of the work-supporting member.
- the latter has spaced upwardly projecting lugs 26 and 21 which are in a position to be engaged alternately by the dogs 2
- fluid under pressure from a pump 35 enters the inlet port 35'.of a casing 36 for the reversing valve 28 through suitable throttle and control valve mechanisms hereinafter described.
- Outlet ports 31 and 38 in the casing 36 are connected by pipes 39 and 49 to the left and right hand ends respectively of a cylinder 4
- the cylinder has a piston 42 having a projecting rod 43 which is secured to the table, the reciprocatory movements of .the piston in the cylinder procuring corresponding movements of the table.
- the relative crossfeed movement between the workpiece ,in the chuck and the grinding wheel is obtained by movement" of the wheelhead 3 transversely on the bridge 4, this movement being procured in any suitable manner, as by mechanism actuated by the reciprocatory movements of the table, one form of such mechanism being fully'described in the above cited Blood et a1.
- the wheelhead is mounted on a cross-slide, not shown, movement thereof being procured by rotation of a crossfeed screw 44 which engages an internally threaded portion, not shown, of the cross-slide.
- the crossfeed screw which is held against longitudinal movement in the bridge, is turned through a ratchet 45 suitably connected to said crossfeed screw.
- Rotation of theratchet is procured by means of a pawl 46 which is carried by one arm 41 of a lever 48 journaled on a stud 49 on the end of an arm 59 turnable on the crossfeed screw 44.
- of the lever 48 is engageable with an adjustable stop 52 carried by a lug 53 on the arm 59, said stop supporting the lever 48 against counterclockwise movement beyond the position shown.
- also engages an abutment 54 in a lever 55 normally held against turning movement on a stud 56 in the casing 51 which forms a housing for the crossfeed mechanism. 7
- a third arm 58 on the lever 48 is in a position for engagement with a roller 59 on the end of one arm 60 of a bell crank lever 6
- the other arm 62 of the bell crank lever BI is connected by a link 63 to the end of one arm 64 of a bell crank lever 65 journaled on a stud 66 in the casing 51.
- the opposite arm 61 of the lever 65 carries a roller 68 which is in a position for engagement with a cam 69 on a block 18 adjustably secured to the table.
- the ratchet wheel 45. and the crossfeed screw I 44 are preferably connected by mechanism of the type dlsclosedin the Guild Patent No. 1,971,138,
- the grinding operation is under the control of the crossfeed movement and to this end the cam 1
- the screws 13 and 14 are locked in adjusted position within the arm 15.
- the other arm 11 of the bell crank lever 16 is connected by a link 18 to an arm 19 secured to a shaft journaled in the casing 51.
- the shaft 89 projects beyond the casing 51 and'has on the end thereof a depending .arm
- opposite arm 98 of the lever 95 projects upwardly between the lugs 26 and 21 and has a cam surface on its upper end for engagement with the reversing dog 22.
- Said dog is pivotally connected to the block 24 by a pin 24', and the arm 98, when in raised position, elevates the free end of said dog, thereby avoiding engagement between said dog and the lug 21 to permit the table to move to the left beyond its normal reciprocatory position to carry the grinding wheel past the dressing tool.
- the arm 98 is normally in its lower position shown, with the free end of said arm located below the dog 22 and out of engagement therewith, being moved upwardly only when the dressing operation is to take place.
- the pivotally mounted carrier 99 having mounted thereon a dressing tool I00, is swung downwardly to move the dressing tool into alinement with the grinding wheel 6.
- the dressing tool and the supporting structure are of any suitable construction, as for example, the construction described in the Blood Patent No. 1,971,848, dated Aug. 28, 1934, in which the dressing tool is moved downwardly into operative position by fluid under pressure.
- the fluid connection by which the carrier 99 is oscillated will be hereinafter described in connection with the re-' maining fluid pressure mechanism.
- the dressing tool and supporting structure are located on the table to provide for a relative movement between the tool and the grinding wheel.
- a reversing dog !I pivotally mounted on a pin I02 in a block I03 on the table engages the lug 21 and oscillates the valve 28 to reverse the table movement and restore the grinding wheel to operative position relative to the workpiece.
- the arm 99 is moved downwardly into inoperative position by a dog I04 c-ar edby the block I03 on the table.
- a valve III in the casing IIO normally provides fluid connection between the conduit I09 and a second conduit II2 by which fluid is directed to a throttle valve H3 in a casing H4.
- the throttle valve casing H4 is connected by a conduit I I5 to the reversing valve 28. Fluid under pressure is thus directed to the reversing valve through the throttle valve H3.
- the dressing tool is moved downwardly into operative position by a piston IIB slidable in a casing II'I, connected by a conduit IIB to the valve casing I06.
- a conduit II9 which provides connection between the casings I08 and H0 provides fluid connection to the casing Ill.
- the valve III has a full-size portion I20 which normally cuts off the fiow of fluid from the conduit I09 to the conduit I I9.
- the valve III is however, in engagement with the lower end of the arm 92, Fig. 2, and movement of said arm to the right shifts said valve therewith and establishes fluid connection between the conduits I09 and H9 to allow fluid under pressure from the pump to pass directly to the casing Ill and move the dressing tool into operative position.
- connection between the piston I I5 and the dressing tool carrier is by any suitable mechanism, as by the arrangement fully described in the aforesaid BloodPatent No. 1,971,848.
- the shifting movement of the valve III also directs fluid under pressure through a throttled by-pass I2I to the main throttle valve H3 for reducing the rate of travel of the table during the dressing operation.
- the bell crank lever 88 is turned by the arm I25 during the clockwise turning movement of the arm 33 which occurs when the grinding wheel reaches the inner end of the workpiece, at which time the reversing dog 2I engages the lug 26 and procures a turning movement of the arm 33.
- the control mechanism is thus set in operation when the grinding wheel is at the inner end of the workpiece and in response to the movement of the table reversing means. Since the arm 92 moves counterclockwise only when the grinding wheel is at the inner end, of the workpi ce. and
- the cam I22 is in a. proper position to engage with the roller-I23 during the downward movement of the tool carrier and cause the dressing tool and its carrier to move downwardly slowly, guided by the cam I22, until the carrier and tool reach operative position.
- the bell crank lever 88 no longer engages with the notch '90 and the contact between the arm I25 and the arm I28 of the bell cranklever has no effect on the grinding operation.
- 2,011,705 has an integral latch corresponding to the arm 89 of the lever 88 which normally engages in a notch I32 provided by a depending arm I33 corresponding to the arm 92.
- Said arm I 33 is urged counterclockwise by a spring corresponding to the spring 94 and carries a pin, not shown, which engages with a depending arm, also not shown, integral with the lever 95 so that swinging movement of said arm arm 98 is moved higher than it was moved by the previous swinging of the arm 92 to elevate the dog It, thereby rendering both the dogs 22 and IIlI inoperative for a movement of the table to the left beyond its normal operative position,
- This mechanism may be of any suitable type, as for example, that disclosed in Kempton & Galli more No. 1,826,178, dated Oct. 6, 1931, or the Heald et al. Patent No. 1,816,082, dated July 28, 1931.
- the movement of a plunger by fluid under pres-' sure procures a temporary radial separation between the grinding wheel and the workpiece at the beginning of the axial separation, thereby avoiding the objectionable bell mouthing, otherwise resulting. Since the lever I3I is rocked by the turning movement of the member 33, which occurs while the grinding wheelisat the inner end ofthe workpiece, this back-off of the grinding wheel will occur before the grinding.
- the grinding operation having been started and the grinding wheel-being located within the bore of the workpiece, the grinding operation continues with the wheel reciprocating relative to the workpiece and with the cam II advanced clockwise for each reciprocation of the tabe until the screw I3 is engaged and moved upwardly by the cam II for procuring an extended movement of the table for the dressing operationjon the grinding wheel. Movement of the screw I3 procures a shifting movement of the bar 84 to the left,
- Fluid connection to the cylinder I" thus occurs when the grinding, wheel reaches the inner end of the workpiece and,as the dressing tool support swings downwardly, the roller I23 engages with the cam I 22 and the dressing tool is accordingly moved slowly into operative position, being guided by said cam.
- The-dressing tool is carried over the periphery of the grinding wheel and the movement ofthe table is then reversed by the dog II for restoring the grinding wheel and workpiece to operative position for completion of the grinding operation.
- the crossfeed mechanism instead of being actuated by the table reciprocations as' above stated, is hydraulically actuated, as by mechanism of the type shown in the 3100a a Burns Patent No. 2,027,627.
- the transverse movement ofthe cross-slide is obtained by rotation of the crossfeedjscrewfl'l (see also Fig. 7) which engages an internally threaded portion, not shown, of the cross-slide, the latter being mounted on a bridge similar to the bridge 4 above described, which spans the guideways on which the table is reciprocated.
- the crossfeed screw has a gear I38 on the forward end thereof which meshes with a pinion I39 secured against turning movement on a shaft I40 journalled in a casing MI in which the crossfced mechanism is positioned, the casing being mounted on the forward end of the bridge.
- the pinion I39 during the crossfeed movement of the table is rotated in unison with a ratchet wheel I42 which is positively rotated by fluid under pressure, as hereinafter described.
- the rotation of the pinion I39 procures, through rotation of the crossieed screw, a transverse movement of the grinding wheel relative to the work-supporting structure to cause a cutting action onthe workpiece.
- the shaft I40 has journalled thereon an annular member I43 having an integral pinion I44, and a vertically extending rod I45, Fig. 6, has rack teeth I46 which are held in engagement with the pinion I44 by a roller I41 journalled on a pin I48 secured in the casing MI.
- the rod I45 is reciprocated vertically by fluid under pressure for procuring, during its upward movement, a lateral or crossfeed movement of the wheelhead 3, and during its downwardmovement a retraction of the crossfeed movement.
- the sleeve I43 has a flange I49, against which an' annular member I50 is clamped by a threaded nut I5I engaging a porti'on oi the member I43.
- the member I50 thus rotates with the member I43 during a crossfeed movement of the wheelhead or a retraction thereof.
- the annular member I50 has spaced studs I52 and I53, Figs.6 and 8, secured by nuts I52 and I53 to said member. Said studs provide pivotal supports for pawls I54 and I55 normally maintained resiliently in engagement with the ratchet wheel I42 by a spring I56.
- the pawl I55 procures clockwise turning movement of the ratchet wheel in response to a corresponding clockwise rotation of the pinion I44 and the pawl I54 procures counterclockwise turning of the ratchet wheel when the pinion I44 is turned counterclockwise.
- a pin I51 on the pawl I55 is brought into engagement with a shield I58 adjustably positioned in the casing I. Said shield withdraws the pawl from engagement with the ratchet wheel I42 without affecting the crossfeed movement of the wheelhead.
- the annular member I55 is allowed to turn counterclockwise relative to the ratchet wheel, the pawl I54 being inoperative until the pin I5'I has been moved out of engagement with the shield I58.
- the ratchet I42 and member I513 rotate in unison and thus procure a retraction of the grinding wheel from operative position.
- the relative movement between the member I5Il and the ratchet M2 provides for a compensation for the reduction in size of the grinding wheel, as will be apparent.
- fluid under prespiston I60 in a cylinder I5I is actuated as above stated by fluid under prespiston I60 in a cylinder I5I, the latter being mounted, as shown in Fig. 6, on the base of the machine.
- Fluid under pressure from a pump I62 is directed through a conduit I63 to a channel I64 in a casing I65 which has a longitudinal bore in which a valve member I66 is slidable, this valve member corresponding in general to the valve I08 above described.
- the channel I04 is substantially diametrically opposite to a channel I61 which is connected by a conduit IIiB'to a port I69 in a casing I10.
- This casing has a bore in which a valve I1I, corresponding in general to the valve III above described is slidable.
- a channel I12 in the casing I10 is open at one end to the boreat a point substantialy opposite to the port I69 and at the opposite end opens into the bore at a point opposite to the port I13.
- a throttle valve I14 is provided in the channel I12.
- the port I13 is connected by a conduit I15 to the lower end of the cylinder I5I, an adjustable throttle I16 being positioned in the conduit I15, if desired, for controlling the rate of crossfeed movement.
- a port I11 intersects the channel I12 substantially midway between the opposite ends of the channel and this port is directly opposite port I18 which is connected by a conduit I19 to a port I in a casing I8I.
- a second reduced portion of the valve I'II provides fluid connection betw n the cha nel I12 and the port I13.
- the conduit I15 has a branch conduit I82 communicating with a port I83 in a casing I84 having a plunger I85 s lidable therein.
- a port I86 in the casing I84 islongitudinally spaced from the port I83 and is connected by a conduit I81 to a port-I188 in the upper end of the cylinder IIBI, thereby procuring a crossfeed movement of the grinding wheel.
- the throttle valve is also provided with a V-shaped notch 2% adjacent the port I80, thereby providing for adjustment of the flow sol 2,156,970 of fluid from the conduit I19 to the reversing valve.
- the throttle valve I95 has a forwardly projecting valve stem 20I which projects through the cover plate of the control box on the front of the machine and has a lever, not shown, on the front end thereof, for manual adjustment of the valve.
- the shaft 80 has mounted thereon a depending arm 82 which is connected to a horizontally slidable bar 84.
- the left hand end of this bar projects into the control box and is shifted to the left, upon engagement be tween the cam II and either of the screws I3 or 14", for actuating the control mechanism.
- lever 88 has one end 89 thereof in a position for engagement with a notch 90 in a lug 9I"carried by a depending arm 92.
- the latter is journalled on a shaft 93' in the box 81 and is urged counterclockwise by a spring 94.
- a bell crank lever 95 also journalled on a shaft 93, in the box 81 is urged counterclock wise by a spring 94.
- a bell crank lever 95' also journalled on the shaft 93 .has a depending arm 96 which engages with a pin 91 on the arm '92.
- a reversing lever '25 having an integral arm 33.
- the reversing lever is. suitably connected to the reversing valve 28' for shifting the latter, thereby directing fluid under pressure to alternate ends of the cylinder-4
- a piston 42 within the cylinder has a projecting piston rod 43 suitably connected to the table and fluid connection from the reversing valve to opposite ends of the cylinder is providedby conduits'39 and 40'.
- the arm 33 has a stud I24 on which is pivotally mounted an arm I25, the latter being normally urged counterclockwise by a spring I26. In the normal position of the arm I25 it is out of engagement with the depending arm I28 of the ent No. 2,011,705, above referred to.
- the valve III For discontinuing the crossfeed movement during the dressing operation, the valve III has a full-sized portion, which, when the valve is shifted to the right, closes the port I13, thereby preventing the entry of fluid under pressure to the cylinder I BI below the piston I60 while the valve III is in its right hand position.
- the valve III When the valve III is restored to its original position, during the return of the grinding wheel and workpiece to operative relation, fluid connection is again established through the port I'I3 to the cylinder ISI for procuring a further crossfeed movement.
- the dressing tool is moved downwardly into operative position by a piston H6 slidable in a casing II'I connected by a conduit II8 to a port in the valve casing I65 and a similar port directly opposite is connected by a conduit II9 ,to the valve casing I10.
- the valve III has a full sized portion which normally cuts off the flow of fluid from the conduit I 68 to. the conduit 9', but
- valve III whn the valve III is shifted to the right, fluid connection between these two conduits is established to allow fluid under pressure to enter the casing III for movingthe dressing tool into operative position.
- the connection'between the piston H5 and the dressing tool carrier may be, for example, that shown in the above mentioned Blood Patent No. 1,971,848.
- the shifting of the valve III also directs fluid under pressure through the throttled channel I12 for reducing the rate of travel of the table during the dressing operation.
- the reversing dog I I carried by the block I03 on the'table engages and shifts the reversing lever 25 for reversing the table movement.
- the arm 98' is moved downwardly into inoperative position by a pivotally mounted dog I04 carried by the block I03.
- the arm I33 is urged counterclockwise by a spring corresponding to the spring 94' and upon swinging movement to the right procures a corresponding upward movement of the arm 98, this elevating movement being higher than during the previous upward movement of 'the lever, thereby rendering both dogs 22' and IOI' inoperative to allow the table to move to its extreme right hand position, where it isv brought to rest.
- Fluid connection from thepump to the conduit I89 is provided by a channel 203 provided in the valve I66.
- the arm I30 is a part of the lever MI and movement of this lever releases the depending arm I33 for again elevating the arm 98 and for shifting the valve I66 to the right. Elevation of the arm 98 causes the table to move to the left to inoperative position and movement of the valve I66 procures a retraction of the crossfeed movement.
- the present invention provides for setting in operation the mechanism which procures the movement of the dressing tool into operativeposition only when the grinding wheel is at the inner end of the workpiece, so that the dressing tool during its movement into operative position will be guided by the same cam whichsubsequently returns the dressing tool to inoperative position.
- the mechanism which actuates the dressing tool is set in operation by the reversing member through which the table movements are procured,
- the same mechanism which procures the movement of the dressing tool at the desired point also may be used for setting other mechanism in operation when the grinding wheel is at the inner end of Such other mechanism may be the structure by which the back-off oi the grinding wheel is obtained.
- the crossfeed movement is independent of the reciprocations of the table the present invention provides for causing the changes in the grinding operation to take place at one end of the normal reciprocation of the table rather than independently thereof, as would occur if the changes in the grinding operation were under the control of the crossfeed mechanism without any interconnection between the control mechanism and the reversing means for the table movement.
- a grinding-machine a grinding member, a work supporting member, a reciprocatory table on which one or said members is mounted for procuring a relative movement therebetween, reversing means for said table, control means for procuring a change in the grinding operation, actuating means for said control means auto- 'matically operative at a predetermined point in tween said actuating means and said reversing means for procuring actuation of said control means by said actuating means only at one end of the table movement.
- a grinding member In a grinding machine, a grinding member, a work-supporting member, a reciprocatory table on which one of said members is mounted for procuring a relative movement therebetween, reversing means for said table, controlmeans for procuring a change in the grinding operation, actuating means for said control means automatically operative at a predetermined point in the grinding operation and independently of the position or the table, and means associated with the reversing means and providing a connection between said actuating means and said control means for actuating said control means only in response to movement of said reversing means.
- a grinding member In a grinding machine, a grinding member, a work-supporting member, a reciprocatory table on which one of said members is mounted for promovement and actuated by movement of said re-' curing a change in the grinding operation, actuating means associated with said reversingmeans for rendering said control means operative in response to shifting of said reversing means, means for procuring a crossfeed movement between said members, and means under the control of the crossfeed movement for shifting said actuating means into operative position.
- control means for procuring a change in the grinding operation
- actuating means associated with said reversing means for rendering said control means operative in response to shifting of said reversing means
- means independent of the table reciprocations for procuring a crossfeed movement between said members, and means under the control of the crossfeed movement for shifting said actuating means into operative position.
- control means forprocuring a change in the grinding operation, means for procuring a crossfeed movement between said members, means responsive to said crossfeed movement for actuating saidcontrol means, and means associated with the reversing .means and providing a connection between said actuating means and said control means whereby 'said actuating means procures actuation of said control means only in response to movement of said reversing means.
- a grinding member a work-supporting member, a reciprocatory table on which one of said members is mounted for procuring a relative movement therebetween, reversing means for said table, control meansfor procuring a change in the grinding operation, means independent of the table reciprocations for procuring a crossfeed movement between said -members, means responsive to said crossfeed movement for actuating said control means, and means associated with the reversing means and providing a connection between said actuating means and said control means whereby said ac- ,tuatingmeans procures actuation of said control means only in response to movement of said a work-supporting member, a reciprocatory table on which one of said members is mounted for procuring a relative movement therebetween, re-
- control means for procuring a change in the grinding operation
- a latch for holding said control means in inoperativeposition
- means for procuring a crossfeed movement between said members and means rendered operative in response to said crossfeed versing means at one end of the table movement for tripping said latchl- 9.
- a work-supporting member a reciprocatory table on which one of said members is mounted for procuring a relative movement therebetween, reversing means for said table, control means for procuring a change in the grinding operation, a latch for holding said control means in inoperative position, actuating means for said latch carried by said reversing means, and means automatically operative duringthe grinding ope'ration -for shifting the actuating means into latch engaging position.
- a grinding'machine a grinding member, a work-supporting member, a reciprocatory table on which one of said members is mounted for procuring a relative movement therebetween, reversing means for said table, control means for procuring a change in the grinding operation, a'latch for holding said control means in inoperative position, actuating means for said latch carried by said reversing means, means for procuring a crossfeed movement between said members, and means responsive to said crossfeed movement for shifting the actuating means into latch engaging position.
- a grinding machin a grinding member, a work-supporting member, a reciprocatory table for one of said members for procuring a relative movement therebetween, a dressing member mounted for movement relative to the grinding member in response to the table mover ment, said dressing member having an inoperative and an operative position in alinement with the position of the grinding member, reversing means for said table, control means for procuring movement of the dressing member into op- I erative position, means for procuring a crossfeed movement between the grinding member and the work-supporting member, means on said reversing means for rendering said control means operative',,and-means responsive to the crossfeed movement for shifting said last means into operative position;
- a grinding machine a grinding member, a dressing member having an inoperative and operative position in alinement with the periphery of the grinding member, a reciprocatory table for one of said members for procuring a relative movement therebetween, reversing means for said table, control means for procuring movement of the dressing member into operative position, a cam in fixed relation to the grinding ,member for moving the dressing member out of operative position, and means on the reversing means for rendering said control means operative to procure movement of the dressing memberinto operative position at one end of the table movement, whereby said cam will guide the dressing member into operative position.
- a work-supporting member for her, a work-supporting member, a table on which one oii said members is mounted and whose movement procures a relative axial movement between said members, reversing means for reversing the direction of movement of the table, automatic control means for interrupting the normal reciprocatory movements of said table, a latch for normally retaining said control means in an inoperative position, meansfor procuring a crossfeed movement between said members, means on, said reversing means for actuating said latch, and mechanical elements adaptedto be shifted in response to the crossfeed movement for rendering said lastmeans operative.
- a grinding member In a'grinding machine, a grinding member, a dressing tool member having an inoperative and an operative'position, a table on which ing said other means operative.
- a grinding machine the combination with a grinding wheel, a dressing tool having an operative and an inoperative position, a table for procuring a relative movement between said parts, means including a reversing member and reversing dogs for reversing the direction of movement oi. said table, cam means for moving the dressing tool out oi operativeposition, actuating means for shifting the tool into operative position, and control means for said actuating means, of means associated with said control means and forming a part of the reversing means to provide for actuation of said control means only atone end of the table movement, said cam being positioned to guide the tool into operative position.
- a grinding machine the combinationwith a grinding member, a work-supporting member, a table on which one of said members is mounted for procuring a relative ,movement therebetween, a dressing tool having an operative and an inoperative position and mounted for movement relative to the grinding member in response to the table movement, means including a reversing member for reversing the direction of movement of said table, cam meansi'or moving the dressing tool out of operative position, actuating means for shifting the tool into operative position, and control means for said actuating means, of means associated with said control meansand forming a part of the reversing means toprovide for actuation of said control means only at one end of the. table movement, and means automatically operative during the grinding operation for rendering said last means operative.
- a grinding machine the combination with a grinding member, a work-supporting member, a table on which one of said members is mounted for procuring a relative movement therebetween, a dressing tool having an opera tive and an inoperative position and mounted for a part of the reversing means to provide for 'actuation of said control means only at one end of the table movement, and means responsive to the crossfeed movement to render said last means operative.
- a grinding member In a grinding machine, a grinding member, a work-supporting member, a reciprocating table on which one of said members'is mounted for procuring a relative movement between said members,reversing means for the table, control means for procuring a radial separation between said members and simultaneously an axial separation therebetween by an extended movement of the table,-actuating means associated with said reversing means for rendering said control means operative in response to shifting of said reversing means, means for procuring a crossi'eed movement between said members, and means responsive to said crossfeed movement for shifting said actuating means into operative position.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
Description
May 2, 1939.
A. P, BURNS GRINDING MACHINE Filed July 3, 1937 4 Sheets-Sheet l llllllJ. I ll 4 Alfred E Burns w, 2| 7 WW May 2, 1939, A. P. BURNS GRINDING MACHINE 4 Sheet-Sheet 2 Filed July 3, 1937 May 2, 1939. A P BURNS 2,156,9'70
GRINDING MACHINE Filed July 3, l93'7 4 Sheets-Sheet 3 m %W M/ May 2, 1939. A. P. BURNS 2,
- GRINDING MACHINE Filed July 3, 1937 4 Sheets-Sheet 4 01: 9 3 fllfmd P Bums Patented May. 2, 1939 UNITED STATES PATENT OFFICE The Heald Machine Company, Worcester,
Mass., a corporation of Massachusetts Application July 3, 1937, Serial Np. 151,885
18 Claims.
The present invention relates to a. grinding machine for the successive reduction of a plurality of workpieces all to a predetermined size, and is particularly applicable to machines for grinding the internal surfaces of sleeves, bushings and like articles. This application is a continuationin-part of applicants copending application Serial No. 50,777.
In grinding machines of the type disclosed in the Blood Patent No. 2,011,705, dated August 20, 1935, the progress of the grinding operation is selectively under the control of the cross-feed mechanism or under the control of gages which successively enter the bore of the workpiece as the latter approaches and reaches the desired size. When the grinding operation is under the control of the cross-feed mechanism an axial separation between the grinding wheel and a workpiece in the work-supporting .tructure is provided prior to completion of the grinding operation, during which axial separation the grinding wheel is dressed. The dressing tool, which is normally in an inoperative position, is moved downwardly, preferably by fluid under pressure, into alinement with the periphery of the grinding wheel, the movement of the tool occurring during the extended movement of the table which procures the relative axial movement between the grinding wheel and workpiece. The crossfeed mechanism is also frequently used for controlling other machine movements, such as a back-off of the wheel relative to the workpiece prior to the withdrawal of the wheel from within the workpiece core at the completion of the grinding operation.
In the Blood Patent No. 2,011,705, the crossfeed mechanism is actuated by a cam which is mounted on the reciprocatory table and is ad justed to engage with a roller forming part of the crossfeed mechanism so that the roller is rocked during each reciprocation of the table. The cam and roller arrangement provides for a step-by-step crossfeed movement of the grinding wheel relative to the workpiece and this step-bystcp advance may occur at any point of the table travel during the normal reciprocation thereof. Although the cam is preferably adjusted on the table so that the step-by-step advance of the wheel may occur at one end of the normal reciprocatory movement of the table, but this adjustment frequently carelessly made so that the step-by-step advance does not occur at the desired point. Since the. control mechanism which procures a runout of the table, either for the dressing operation during the grinding operation, or for a final separation between the wheel and the workpiece at the completion of the grinding, is actuated by the crossfeed mechanism, it would be apparent that the control mechanism is set in operation substantially at the same time that the cam on the table engages with the roller during one of the table reciprocations. The control mechanism may thus be actuated at any point in the normal reciprocation of the table, dependent upon the position 10 of the table at the time that the feed cam engages and shifts the roller by which the crossfeed mechanism is actuated. If the grinding wheel is at the inner end of the workpiece, when the mechanism for shifting the tool is set in op- 15 eration, the downward movement of the dressing tool is controlled by a cam on the machine which is located in a position to engage with a roller carried by the dressing tool support, thereby causing the dressing tool to move smoothly into 20 operative position.
This cam, which controls the dressing tool movement, also cooperates with the roller in returning the dressing tool support to inoperative position when the grinding wheel and work- 2 piece are returned to operative position, and is thus movable relative to the dressing tool support. Thus when the table carries the dressing tool. as in the Blood patent aforesaid, the cam is carried by the base of the machine. The cam is 3 thus in a position to cooperate with the roller if the dressing tool begins its downward movement while the wheel is still within the bore of the workpiece.
If the grinding wheel is adjacent the outer 35 end of the workpiecewhen the mechanism for moving the dressing tool is set in operation, the roller on the dressing tool support cannot engage with the cam since the latter is already longitudinally spaced therefrom. The dressing 49 tool is thus moved rapidly down into operative position, where it is suddenly brought to rest, with the result that the machine or the tool is jarred and the tool is not properly located. By. the sudden stopping of the swinging tool, the L5 latter does not always remain in its lowermost position and thus does not produce a smooth periphery on the grinding wheel. This inaccuracy is particularly objectionable when the workpieces must be ground to very close tolerances. One of the principal objects of the present invention is to avoid the above noted objection by having the dressing tool always guided into operative position by the cam which cooperates with the dressing tool structure and which sub- 55 sequently moves the dressing tool upwardly into inoperative position.
Similarly, if the control mechanism by which the back-off is procured is actuated by the crossfeed mechanism, this back-off may occur at any point in the normal reciprocation of the table. If the back-off occurs when the wheel is at the inner end of the workpiece the wheel is backed away from the work while substantially, the entire length of the wheel is in contact with the workpiece surface and no damage is done to the wheel or work. On the other hand, if the backofi. is initiated at a time when the wheel is adjacent to the outer end of the workpiece, the wheel is not always backed away until the axial separation between the wheel and the workpiece has carried the wheel to such a position that only a relatively small portion of the entire length of the wheel is in engagement with the workpiece surface. When this occurs, the workpiece is ground unevenly with the so-called bell mouthing which obviously affects the salability and frequently the utility of the workpiece. This bell mouthing results from the increased grinding action of the Wheel on the workpiece as the length of the line of contact between the wheel and the workpiece is diminished. One of so that the transverse movement of the grinding wheel relative to the workpiece is continuous rather than by a step-by-step motion, as in the patent above referred to, and the crossfeed movement is therefore independent of the table reciprocation. In order to avoid the objections above noted in the downward movement of the dressing tool into operative position and in the radial back-off of the grinding wheel, it is essential that the control mechanism, by which the dressing tool is shifted and by which the back-' off is procured, be set in operation when the grinding wheel is at the inner end of the workpiece. To this end, the present invention involves the provision of a structure which, in association with the crossfeed mechanism, will set the control mechanism in operation at the end of the table reciprocation when the wheel is at the inner end of the workpiece. By this arrangement the control mechanism may be actuated by the crossfeed mechanism in the desired manner, but a suitable interconnection between the control mechanism and the table reversing mechanism assures that the control mechanism will function at one end of the table stroke.
According to the present invention the machine is so arranged that the mechanism which procures the runout of the table for the dressing operation is set in motion when the grinding wheel is at the inner end of the workpiece. With the mechanism set in operation at this point, as by mechanism controlled by the table reversing means, the dressing tool is moved downwardly and engages with the cam when the wheel begins its, withdrawal movement relative to the worksupport.
Other and further objects and advantages of the invention will more fully appear from the following detailed description taken in connection with the accompanying drawings, in which Fig. 1 is a front elevation of the mchine embodying the invention.
Fig. 2 is a front elevation on a larger scale of the mechanism within the control box and a portion of the crossfeed mechanism, parts broken away to show the construction more fully.
Fig. 3 is an elevation of a portion of the mechanism of Fig. 2 before the beginning of thedressln operation.
Fig. 4 is a view corresponding to Fig. 3, showing the position of the parts at the beginning of the dressing operation. a
Fig. 5 is a fluid pressure diagram.
Fig. 6 is a front elevation corresponding to Fig. 2, showing a modified type of grinding machine to which the present invention is applied.
Fig. '7 is a sectional view along the line of Fig. 6.
, Fig. 8 is a sectional view alongthe line 8-8 -of Fig. 7.
Fig. 9 is a fluid pressure diagram for the machine of Fig. 6.
Like reference characters refer to like parts in the different figures.
Referring first to Fig. l, the machine has the usual reciprocatory table I provided in an internal grinding machine. Either the grinding wheel or the work to be ground is carried on said table, the reciproacticns of the latter operating in either case to procure a relative reciprocatory movement between said grinding wheel and the workpiece.
In the construction'shown the table supports and carries a workhead 2 and a wheelhead 3 is mounted on abridge 4 which spans the guideways, not shown, provided by the base 5 of the machine for the movements of the table I. The grinding wheel 6 is carried on a spindle 'I journaled in the wheelhead 3, and the workpiece not shown is mounted in a suitable work-supporting member in the form of a chuck .8 carried on the end of a spindle 9 journaled in the workhead.
Both the grinding wheel and the workpiece are positively rotated as from a driving motor III mounted on the base of the machine. In the construction shown, the drive shaft of said motor carries a large diameter pulley ll connected by a belt I2 to a pulley l3 on a countershaft l4 journaled within the base. A second pulley IS on the countershaft I4- is connected by a belt IE to a small diameter pulley IT on the grinding wheel spindle 1, thereby driving the grinding wheel at a high rate of speed. The drive shaft of the motor is also connected to a drum l8 journaled within the base of the machine and connected by a belt H! to a pulley 2|! on the spindle 9. The arrangement of belts and pulleys preferably provides for a rotation of the grinding wheel at a much higher rate of speed than that of the work-supporting member.
The reciprocations of the table I, which cause the rotating grinding wheel to make the desired traverse over the surface of a workpiece mounted in the chuck, are imparted in any well known manner, as by the use of the fluid pressure controlling reversing mechanism described in the Heald 8: Guild Patent No. 1,582,468, dated April 27, 1926. It is suificient to note for the purpose of the present application that reversal of the table movement at each end of the normal working stroke is procured by the use of spaced reversing dogs 2| and 22 carried by blocks 23 and 24 adjustably secured to the table and adapted a1- e 2,188,970 ternately to engage and move a reversing member 26. The latter has spaced upwardly projecting lugs 26 and 21 which are in a position to be engaged alternately by the dogs 2| and 22 respectively, while the grinding wheel is located withinsame shaft 34 to which the reversing member 25 is secured. Movement of the member 25 accordingly shifts the position of the valve 28 and reverses the table movement.
Referring now to Fig. 5, fluid under pressure from a pump 35 enters the inlet port 35'.of a casing 36 for the reversing valve 28 through suitable throttle and control valve mechanisms hereinafter described. Outlet ports 31 and 38 in the casing 36 are connected by pipes 39 and 49 to the left and right hand ends respectively of a cylinder 4| mounted in the base of the machine. The cylinder has a piston 42 having a projecting rod 43 which is secured to the table, the reciprocatory movements of .the piston in the cylinder procuring corresponding movements of the table.
The relative crossfeed movement between the workpiece ,in the chuck and the grinding wheel is obtained by movement" of the wheelhead 3 transversely on the bridge 4, this movement being procured in any suitable manner, as by mechanism actuated by the reciprocatory movements of the table, one form of such mechanism being fully'described in the above cited Blood et a1. Patent No. 2,011,705. As bestshown in Fig. 2, the wheelhead is mounted on a cross-slide, not shown, movement thereof being procured by rotation of a crossfeed screw 44 which engages an internally threaded portion, not shown, of the cross-slide. The crossfeed screw, which is held against longitudinal movement in the bridge, is turned through a ratchet 45 suitably connected to said crossfeed screw. Rotation of theratchet is procured by means of a pawl 46 which is carried by one arm 41 of a lever 48 journaled on a stud 49 on the end of an arm 59 turnable on the crossfeed screw 44. A second arm 5| of the lever 48 is engageable with an adjustable stop 52 carried by a lug 53 on the arm 59, said stop supporting the lever 48 against counterclockwise movement beyond the position shown. The arm 5| also engages an abutment 54 in a lever 55 normally held against turning movement on a stud 56 in the casing 51 which forms a housing for the crossfeed mechanism. 7
A third arm 58 on the lever 48 is in a position for engagement with a roller 59 on the end of one arm 60 of a bell crank lever 6| pivotally mounted on the stud'56. The other arm 62 of the bell crank lever BI is connected by a link 63 to the end of one arm 64 of a bell crank lever 65 journaled on a stud 66 in the casing 51. The opposite arm 61 of the lever 65 carries a roller 68 which is in a position for engagement with a cam 69 on a block 18 adjustably secured to the table. During each reciprocation of the table, while the grinding wheel and workpiece are in operative position, the cam engages beneath said roller and procures an oscillation of the arm 65 and a corresponding upward movement of the pawl 46 for advancing the ratchet 45 clockwise. A step-by-step crossfeed movement of the grinding-wheel relative to the workpiece is. thus a8 sured.
The ratchet wheel 45. and the crossfeed screw I 44 are preferably connected by mechanism of the type dlsclosedin the Guild Patent No. 1,971,138,
' dated August 21, 1934'. By this mechanism, which forms no essential feature of the present invention, the reduction in diameter of the grinding wheel, as a result of wear and'the dressing operations performed thereon, 'is automatically compensated for so that each successively ground workpiecewill be reduced to the predetermined diameter independently of variations in the di- For the purpose ameter of the grinding wheel. of the present invention, it will be sufficient to note that a cam 1| is carriedby a ring 12 which is movable relative to the crossfeed screw and is arranged to be shifted relative thereto, asby the mechanism of the Guild patent, so that when the workpiece reaches a predetermined size said cam will always be at a predetermined point relative to the casing 51. During each grinding operation said cam advances as a unit with the ratchet wheel and crossfeed screw, the relative movement therebetween being procured during the retraction of the crossfeed movement between successive grinding operations.
As above stated, the grinding operation is under the control of the crossfeed movement and to this end the cam 1|, which, during the grind ing operation, is advanced clockwise in unison with the ratchet wheel, moves into engagement successively with the ends of adjustable screws 13 and 14 carried by an arm 15 of a bell crank lever 16 which is-journaled on the stud 66. The screws 13 and 14 are locked in adjusted position within the arm 15.,' The other arm 11 of the bell crank lever 16 is connected by a link 18 to an arm 19 secured to a shaft journaled in the casing 51. A spring 8|, which engages the arm 19,.urges the bell crank lever 16 clockwise into the position of Figs. 2 in readiness for rocking movement of said lever by the cam 1|.
The shaft 89 projects beyond the casing 51 and'has on the end thereof a depending .arm
82 which carries a bolt 83 by which a horizon-- by a lug 85 on a bracket 86 within the control Engagement of the cam 1| with the v box 81. screw 13, and subsequently with the screw 14, procures two successive movements of the horizontal bar 84 .to the left, thereby procuring changes in the grinding operation through actuation of the control mechanism, hereinafter described.
'I'he first change in the grinding operation inbell crank lever 88, Fig. 2, one arm 89 of which engages a notch 90 in a lug 9| carried by a depending arm 92. The later is journaled on a shaft 93 in the box 81 and is urged counterclockwise-by a spring 94. A bell crank lever 95 also journaled on the shaft 93 has a depending arm 96 which engages with a pin 91 on the arm 92. The
opposite arm 98 of the lever 95 projects upwardly between the lugs 26 and 21 and has a cam surface on its upper end for engagement with the reversing dog 22. Said dog is pivotally connected to the block 24 by a pin 24', and the arm 98, when in raised position, elevates the free end of said dog, thereby avoiding engagement between said dog and the lug 21 to permit the table to move to the left beyond its normal reciprocatory position to carry the grinding wheel past the dressing tool. The arm 98 is normally in its lower position shown, with the free end of said arm located below the dog 22 and out of engagement therewith, being moved upwardly only when the dressing operation is to take place.
As the table moves to the left beyond its normal reciprocatory position, the pivotally mounted carrier 99; having mounted thereon a dressing tool I00, is swung downwardly to move the dressing tool into alinement with the grinding wheel 6. The dressing tool and the supporting structure are of any suitable construction, as for example, the construction described in the Blood Patent No. 1,971,848, dated Aug. 28, 1934, in which the dressing tool is moved downwardly into operative position by fluid under pressure. The fluid connection by which the carrier 99 is oscillated will be hereinafter described in connection with the re-' maining fluid pressure mechanism. The dressing tool and supporting structure are located on the table to provide for a relative movement between the tool and the grinding wheel.
After the dressing tool has passed the grinding wheel during the extended movement of the table to the left, a reversing dog !I pivotally mounted on a pin I02 in a block I03 on the table engages the lug 21 and oscillates the valve 28 to reverse the table movement and restore the grinding wheel to operative position relative to the workpiece. During the movement of the table to bring the grinding wheel and workpiece into operative position after the dressing operation, the arm 99 is moved downwardly into inoperative position by a dog I04 c-ar edby the block I03 on the table. The dog dEEPicSSGS the arm 98 and rocks the arm 92 clockwise, the latter being held against subsequent counterclockwise movement by a latch I05, the operation of which is fully d scribed in the aforesaid Blood & Burns Patent through a conduit I0'I, passes around a reduced Y portion I08 of valve I08 and through a conduit I09 to a valve casing I I0. A valve III in the casing IIO normally provides fluid connection between the conduit I09 and a second conduit II2 by which fluid is directed to a throttle valve H3 in a casing H4. The throttle valve casing H4 is connected by a conduit I I5 to the reversing valve 28. Fluid under pressure is thus directed to the reversing valve through the throttle valve H3.
The dressing tool is moved downwardly into operative position by a piston IIB slidable in a casing II'I, connected by a conduit IIB to the valve casing I06. A conduit II9 which provides connection between the casings I08 and H0 provides fluid connection to the casing Ill. The valve III has a full-size portion I20 which normally cuts off the fiow of fluid from the conduit I09 to the conduit I I9. The valve III is however, in engagement with the lower end of the arm 92, Fig. 2, and movement of said arm to the right shifts said valve therewith and establishes fluid connection between the conduits I09 and H9 to allow fluid under pressure from the pump to pass directly to the casing Ill and move the dressing tool into operative position. The connection between the piston I I5 and the dressing tool carrier is by any suitable mechanism, as by the arrangement fully described in the aforesaid BloodPatent No. 1,971,848. The shifting movement of the valve III also directs fluid under pressure through a throttled by-pass I2I to the main throttle valve H3 for reducing the rate of travel of the table during the dressing operation.
The return of the arm 92 substantially to original position after the dressing operation and during the return of the table to normal reciprocatory position restores the valve III substantially to the position of Fig. 5, thereby cutting ofif the flow of fluid under pressure to the casing III to allow the dressing tool support to be moved upwardly into the inoperative position of Fig. 1. This return movement is posi- 'tively procured by engagement between a cam I22 on the bridge 4 and a roller I23 on the dressing tool carrier. The cam I22 is so located as to move the carrier upwardly as soon 'as the dressing tool passes the wheel during the return movement of the table to normal reciprocatory position. The complete arrangements shown in Fig. 5 are fully described in the aforesaid Blood et al. Patent No. 2,011,705, and not being essential to the present invention, are not further described.
The above described mechanism is fully disclosed in prior patents or copending applications and is not of itself a part or the present invention. The latter iXlVOl CS he attainment, in connection w th the above, or similar machine instrumentalities, of the novel and usefulresults herein set forth. According to the present invention the movement of the arm '92 by which the mechanism controlling the dressing operation is started, occurs only when the grinding wheel is at the inner end of the workpiece. To this end the bell crank lever 33, forming part of whicluis pivotally mountedxan arm I25, the latter.
being normally urged counterclockwise by a spring I26 positioned between said arm and 2. lug i2? on the lever 33. In the normal position of the arm I25 it is out of engagement with a depending arm I28 of the bell crank lever 88, as shown 'in Fig. 3, the arm I25 being held against a. pin I29 on the bar 84. The oscillation of the lever 33 thus has no efiect on the lever 88 while the bar 84 remains in the position of Figs. 2 and 3. When the screw I3 is elevated by the cam II, however, the bar 84 is moved to the left, as above pointed out, moving the pin I29 on said bar to the left and thereby swinging the free end of the arm 825 to the left into the position of Fig. 4. When this occurs, as shown in Fig. 4, the, end of the arm I25 engages with the arm I28 and procures a clockwise turning movement of the bell crank lever 98 into the position shown to release the depending arm 92. g
The bell crank lever 88 is turned by the arm I25 during the clockwise turning movement of the arm 33 which occurs when the grinding wheel reaches the inner end of the workpiece, at which time the reversing dog 2I engages the lug 26 and procures a turning movement of the arm 33. The control mechanism is thus set in operation when the grinding wheel is at the inner end of the workpiece and in response to the movement of the table reversing means. Since the arm 92 moves counterclockwise only when the grinding wheel is at the inner end, of the workpi ce. and
40 I33 elevates the arm 98. The free end of thesince the movement or the arm 92 procures a downward movement of the dressing tool into operative position, the cam I22 is in a. proper position to engage with the roller-I23 during the downward movement of the tool carrier and cause the dressing tool and its carrier to move downwardly slowly, guided by the cam I22, until the carrier and tool reach operative position. During the remainder of the grinding operation, after the grinding wheel is dressed, the bell crank lever 88 no longer engages with the notch '90 and the contact between the arm I25 and the arm I28 of the bell cranklever has no effect on the grinding operation.
After the grinding wheel and workpiece have been returned to operative position, following the dressing operation, the grinding continues with the grinding wheel given a cross-feed movement until the cam II engages and elevates the screw I4 to procure a second extended movement of the table to the left to separate the grinding wheel from the workpiece, thereby bringing the grinding operation to a close. This second extended movement ofthe table is procured through a further movement of the bar 8-I to the left, swinging the arm I25 even more to the left into engage.- ment with the depending arm I30, Fig. 4, of a bell crank lever I3I located directly in back of the bell' crank lever 88. This bell crank lever, as fully described in the above mentioned Blood et al. Patent No. 2,011,705, has an integral latch corresponding to the arm 89 of the lever 88 which normally engages in a notch I32 provided by a depending arm I33 corresponding to the arm 92. Said arm I 33 is urged counterclockwise by a spring corresponding to the spring 94 and carries a pin, not shown, which engages with a depending arm, also not shown, integral with the lever 95 so that swinging movement of said arm arm 98 is moved higher than it was moved by the previous swinging of the arm 92 to elevate the dog It, thereby rendering both the dogs 22 and IIlI inoperative for a movement of the table to the left beyond its normal operative position,
'ment away from the workpiece surface to prevent engagement between the grinding wheel and the workpiece during the axial separation thereof. This mechanism may be of any suitable type, as for example, that disclosed in Kempton & Galli more No. 1,826,178, dated Oct. 6, 1931, or the Heald et al. Patent No. 1,816,082, dated July 28, 1931. In the structure of either of these patents the movement of a plunger by fluid under pres-' sure procures a temporary radial separation between the grinding wheel and the workpiece at the beginning of the axial separation, thereby avoiding the objectionable bell mouthing, otherwise resulting. Since the lever I3I is rocked by the turning movement of the member 33, which occurs while the grinding wheelisat the inner end ofthe workpiece, this back-off of the grinding wheel will occur before the grinding.
wheel begins its withdrawal movement from the 15 workpiece bore. I
In the operation of the machine, which will be apparent from the foregoing description, the grinding operation" having been started and the grinding wheel-being located within the bore of the workpiece, the grinding operation continues with the wheel reciprocating relative to the workpiece and with the cam II advanced clockwise for each reciprocation of the tabe until the screw I3 is engaged and moved upwardly by the cam II for procuring an extended movement of the table for the dressing operationjon the grinding wheel. Movement of the screw I3 procures a shifting movement of the bar 84 to the left,
thereby bringing the end of the arm I25 into a position for engagement with the end of the arm I28. When the reversing members 25 and'33 are next moved clockwise by the reversing dog 2|, this movement occurring when the grinding wheel is at the inner end of the workpiece, the downward movement of the arm I25 on the member 33 rocks the bell crank lever 88 clockwise and withdraws the arm 89 from the notch 90. This permits the arm 92 to move to the right, elevating the dog 22 to permit the table to move beyond its normal reciprocatory position and, at the same time shifting the valveI I I to the right to provide fluid connection from the pump 34 to the cylinder III for procuring a downward swinging movement of the dressing tool support. Fluid connection to the cylinder I" thus occurs when the grinding, wheel reaches the inner end of the workpiece and,as the dressing tool support swings downwardly, the roller I23 engages with the cam I 22 and the dressing tool is accordingly moved slowly into operative position, being guided by said cam. The-dressing tool is carried over the periphery of the grinding wheel and the movement ofthe table is then reversed by the dog II for restoring the grinding wheel and workpiece to operative position for completion of the grinding operation.
After the grinding wheel and workpiece are restored to I operative position after the dressing operation, the grinding continues with the grinding wheel given a further crossfeed movement until the screw His engaged and elevated by the cam 'II thereby shifting the bar 84 further to the left to bring the end of the arm I25 into alinement with the end of the arm I38 for turning movement of the latter when the'reversing member 33 is given its next clockwise turning movement. This clockwise turning movement of the arm 33 occurs when.the table isat'the right hand end of its reciprocatory'movement with the grinding wheel at the inner end of the workpiece and this shifting movement of the-member 33 allows the depending arm I33 to swing to the right, thereby elevating the arm 98 to render the dogs 22 and I0! inoperative for a runout of thetable to the left to rest position. The swinging movement of the arm I33 also shifts'the 'valve I 88 to render the fluid pressure back-off mechanism operative, thereby avoiding contact between the wheel and the work during the runout. Theback-ofi is accordingly procured when the grinding wheel is at the inner end of the workpiece by the arm I25 which is rendered operative by mechanism under the control of the crossfeed movement.
With reference now toFig. 6, the crossfeed mechanism, instead of being actuated by the table reciprocations as' above stated, is hydraulically actuated, as by mechanism of the type shown in the 3100a a Burns Patent No. 2,027,627. To this 4 end the transverse movement ofthe cross-slide is obtained by rotation of the crossfeedjscrewfl'l (see also Fig. 7) which engages an internally threaded portion, not shown, of the cross-slide, the latter being mounted on a bridge similar to the bridge 4 above described, which spans the guideways on which the table is reciprocated.
The crossfeed screw has a gear I38 on the forward end thereof which meshes with a pinion I39 secured against turning movement on a shaft I40 journalled in a casing MI in which the crossfced mechanism is positioned, the casing being mounted on the forward end of the bridge. The pinion I39 during the crossfeed movement of the table is rotated in unison with a ratchet wheel I42 which is positively rotated by fluid under pressure, as hereinafter described. The rotation of the pinion I39 procures, through rotation of the crossieed screw, a transverse movement of the grinding wheel relative to the work-supporting structure to cause a cutting action onthe workpiece.
As shown in Fig. 7, the shaft I40 has journalled thereon an annular member I43 having an integral pinion I44, and a vertically extending rod I45, Fig. 6, has rack teeth I46 which are held in engagement with the pinion I44 by a roller I41 journalled on a pin I48 secured in the casing MI. The rod I45 is reciprocated vertically by fluid under pressure for procuring, during its upward movement, a lateral or crossfeed movement of the wheelhead 3, and during its downwardmovement a retraction of the crossfeed movement. Again referring to Fig. 7, the sleeve I43 has a flange I49, against which an' annular member I50 is clamped by a threaded nut I5I engaging a porti'on oi the member I43. The member I50 thus rotates with the member I43 during a crossfeed movement of the wheelhead or a retraction thereof.
The annular member I50 has spaced studs I52 and I53, Figs.6 and 8, secured by nuts I52 and I53 to said member. Said studs provide pivotal suports for pawls I54 and I55 normally maintained resiliently in engagement with the ratchet wheel I42 by a spring I56. The pawl I55 procures clockwise turning movement of the ratchet wheel in response to a corresponding clockwise rotation of the pinion I44 and the pawl I54 procures counterclockwise turning of the ratchet wheel when the pinion I44 is turned counterclockwise.
During the crossfeed movement of the grinding wheel a pin I51 on the pawl I55 is brought into engagement with a shield I58 adjustably positioned in the casing I. Said shield withdraws the pawl from engagement with the ratchet wheel I42 without affecting the crossfeed movement of the wheelhead. During the subsequent retraction of the crossfeed movement by counterclockwise rotation of the pinion I44 the annular member I55 is allowed to turn counterclockwise relative to the ratchet wheel, the pawl I54 being inoperative until the pin I5'I has been moved out of engagement with the shield I58. During the remainder of the retracting movement the ratchet I42 and member I513 rotate in unison and thus procure a retraction of the grinding wheel from operative position. The relative movement between the member I5Il and the ratchet M2 provides for a compensation for the reduction in size of the grinding wheel, as will be apparent.
The rod I45, by which the pinion MI is rotated,
is actuated as above stated by fluid under prespiston I60 in a cylinder I5I, the latter being mounted, as shown in Fig. 6, on the base of the machine. Fluid under pressure from a pump I62 is directed through a conduit I63 to a channel I64 in a casing I65 which has a longitudinal bore in which a valve member I66 is slidable, this valve member corresponding in general to the valve I08 above described. The channel I04 is substantially diametrically opposite to a channel I61 which is connected by a conduit IIiB'to a port I69 in a casing I10. This casing has a bore in which a valve I1I, corresponding in general to the valve III above described is slidable.
A channel I12 in the casing I10 is open at one end to the boreat a point substantialy opposite to the port I69 and at the opposite end opens into the bore at a point opposite to the port I13. A throttle valve I14 is provided in the channel I12. The port I13 is connected by a conduit I15 to the lower end of the cylinder I5I, an adjustable throttle I16 being positioned in the conduit I15, if desired, for controlling the rate of crossfeed movement. A port I11 intersects the channel I12 substantially midway between the opposite ends of the channel and this port is directly opposite port I18 which is connected by a conduit I19 to a port I in a casing I8I.
With the valves I66 and "I in the position shown, these being the positions of the valves at the beginning of the grinding operation, fluid under pressure is admitted to the conduit I15 from the pump for actuating the crossfeed mechanism, the fluid passing around a reduced portion of the valve I65 and a reduced portion of the valve III. A second reduced portion of the valve I'II provides fluid connection betw n the cha nel I12 and the port I13. I
The conduit I15 has a branch conduit I82 communicating with a port I83 in a casing I84 having a plunger I85 s lidable therein. A port I86 in the casing I84 islongitudinally spaced from the port I83 and is connected by a conduit I81 to a port-I188 in the upper end of the cylinder IIBI, thereby procuring a crossfeed movement of the grinding wheel.
The function and shifting movements of the valves ltd and III, so far as they control the movements of the table, are fully described in the Blood 8; Burns application Seriai No. 631,334, filed July 20, 1933, now Patent No. 2,011,705. For the purposes of the present application itwill be ,sufii-. cient to note that the casing I65, Fig. 9, has a port I92 spaced from the port I64 and connected by a conduit its to a port I94 in the casing I8 I This casing has a longitudinal bore in which the main throttle valve I95 is positioned and this valve has a longitudinal recess I98 which is open at the inner end of the bore in which the valve is located to communicate with a port I91 in the end of the casing. This port is connected by a conduit I93 to the inlet port of the casing 36' for the reversing valve 28. The throttle valve has a rectangular notch I95 in line with the port ISI. The throttle valve is also provided with a V-shaped notch 2% adjacent the port I80, thereby providing for adjustment of the flow sol 2,156,970 of fluid from the conduit I19 to the reversing valve. The throttle valve I95,has a forwardly projecting valve stem 20I which projects through the cover plate of the control box on the front of the machine and has a lever, not shown, on the front end thereof, for manual adjustment of the valve. During the operative reciprocation of the table with the grinding wheel reciprocatingrelative to the surface of the workpiece, fluid is directed through the notch 200 by passing around the reduced portion of the valve III which provided fluid connection between the ports I69 and In this modification the grinding operation is under the control of the crossfeed movement and to this end the annular member has mounted thereon a cam II which, during grinding operation, is advanced clockwise with the member and moves into engagement successively with the ends of adjustable screws I3 and I4 carried by an arm I5 of a bell crank lever 16. which is journalled on the stud 66. The other arm II of the bell crank lever I6 is connected by a link III to an arm I9 securedto a shaft 80 journalled in the casing 51. The shaft 80 has mounted thereon a depending arm 82 which is connected to a horizontally slidable bar 84. The left hand end of this bar projects into the control box and is shifted to the left, upon engagement be tween the cam II and either of the screws I3 or 14", for actuating the control mechanism.
The control mechanism of this modification is similar to that above described. It is sufficient to note for purposes of this modification that the lever 88, Fig.6, has one end 89 thereof in a position for engagement with a notch 90 in a lug 9I"carried by a depending arm 92. The latter is journalled on a shaft 93' in the box 81 and is urged counterclockwise by a spring 94. A bell crank lever 95, also journalled on a shaft 93, in the box 81 is urged counterclock wise by a spring 94. A bell crank lever 95' also journalled on the shaft 93 .has a depending arm 96 which engages with a pin 91 on the arm '92.
gage and shift a reversing lever '25 having an integral arm 33. The reversing leveris. suitably connected to the reversing valve 28' for shifting the latter, thereby directing fluid under pressure to alternate ends of the cylinder-4| which is mounted within the base of the machine. A piston 42 within the cylinder has a projecting piston rod 43 suitably connected to the table and fluid connection from the reversing valve to opposite ends of the cylinder is providedby conduits'39 and 40'.
In accordance with the present invention the arm 33 has a stud I24 on which is pivotally mounted an arm I25, the latter being normally urged counterclockwise by a spring I26. In the normal position of the arm I25 it is out of engagement with the depending arm I28 of the ent No. 2,011,705, above referred to.
is in a position for engagement with the arm I20 when the reversing lever 25' is next shifted clockwise. Clockwise shifting movement occurs when the table is at the right hand end of its normal reciprocatory movement at which time the grinding wheel is at the inner end of the workpiece bore.
When the arm I25 engages the arm I28 the elver '88 is rocked to remove the end 89 from engagement with the notch 90 to allow the depending arm 92' to move to the right, thereby elevating the arm 98 to render the reversing dog 22' inoperative and simultaneously to shift the valve III to the right for causing a movement of the dressing tool into operative position and for discontinuing temporarily the hydraulic crossfeed movement.
For discontinuing the crossfeed movement during the dressing operation, the valve III has a full-sized portion, which, when the valve is shifted to the right, closes the port I13, thereby preventing the entry of fluid under pressure to the cylinder I BI below the piston I60 while the valve III is in its right hand position. When the valve III is restored to its original position, during the return of the grinding wheel and workpiece to operative relation, fluid connection is again established through the port I'I3 to the cylinder ISI for procuring a further crossfeed movement.
The dressing tool is moved downwardly into operative position by a piston H6 slidable in a casing II'I connected by a conduit II8 to a port in the valve casing I65 and a similar port directly opposite is connected by a conduit II9 ,to the valve casing I10. The valve III has a full sized portion which normally cuts off the flow of fluid from the conduit I 68 to. the conduit 9', but
whn the valve III is shifted to the right, fluid connection between these two conduits is established to allow fluid under pressure to enter the casing III for movingthe dressing tool into operative position. The connection'between the piston H5 and the dressing tool carrier may be, for example, that shown in the above mentioned Blood Patent No. 1,971,848. The shifting of the valve III also directs fluid under pressure through the throttled channel I12 for reducing the rate of travel of the table during the dressing operation.
After the dressing tool has been carried past the grinding wheel during the extended movement of the table to the left, the reversing dog I I carried by the block I03 on the'table engages and shifts the reversing lever 25 for reversing the table movement. During the subsequent movement of the table to the right to restore the grinding wheel and workpiece to operative relation, the arm 98' is moved downwardly into inoperative position by a pivotally mounted dog I04 carried by the block I03. Downward movement=of the arm 98 involves a corresponding movement of the arm 92 to the left substantially to its original position, where it is held by a latch I fully described in the Blood 8: Burns Pat- The return of the arm 92 to its original position following the dressing operation returns the valve I'II substantially to the position ofFig'. 9,
workpiece have been returned to operative relation following the dressing operation the grinding action continues extended movement of the table for axially separating the grinding wheel and workpiece. This second extended movement of the table results from a further movement of the bar 84' to the left, thereby moving the arm I25 into a position for engagement with the depending arm I36 of a bell crank lever I3I' located *directly in back of the bell crank lever 88'. This bell crank lever, as above described, has an integral latch corresponding to the arm 89 of the lever 88 which normally engages in a notch I32 provided by a depending arm I33 corresponding to the arm 92'. The arm I33 is urged counterclockwise by a spring corresponding to the spring 94' and upon swinging movement to the right procures a corresponding upward movement of the arm 98, this elevating movement being higher than during the previous upward movement of 'the lever, thereby rendering both dogs 22' and IOI' inoperative to allow the table to move to its extreme right hand position, where it isv brought to rest.
" The lower end of the arm I33 engages with the valve. I66 to shift said valve to the right,
thereby establishing fluid connection from the pump through the conduit I89 to the upper end of the cylinder I6I for a retraction of the crossfeed movement. When fluid enters the upper end ofthe cylinder H6, fluid under pressure is also directed to the upper end of the casing I84 to shift the plunger I85 downwardly, establishing fluid connection between the port I83 and an exhaust port 202 for the exhaust of fluid under pressure from the underside of the piston I66. Fluid connection from thepump to the conduit I89 is provided by a channel 203 provided in the valve I66.
Although the operation of the modified machine disclosed in Figs. 6 to 9 inclusive, will be apparent from the foregoing description, it will be brieflysummarized. After the grinding operation has'been started with the grinding wheel positioned 'in the bore of the workpiece, the grinding continues in the usual manner until the cam II has engaged and. elevated the screw I3, thereby shifting the bar 84' to the left,.Fig. 6, carrying therewith the lower end of the arm I25. During the subsequent clockwise movement of the reversing lever 25' when the table is at the right hand end of its movement, the arm I25 rocks the lever 88, thereby procuring an extended movement of the table to the left by rendering inoperative the reversing dog 22. The valve III is simultaneously shifted to the right, procuring movement of the dressing tool into operative position, andv also temporarily interrupting the hydraulically actuated crossieed movement.
After the dressing tool has been carried past the grinding wheel the reversing dog iti shifts the reversing lever and causes the table to re-,
turn to operative position, the arm 88' and-the valve I'II being restored to original position during the return movement of the table. The rea turn of the valve III allows the dressing tool to be returned to inoperative position and again sets the crossfeed mechanism in operation.
Grinding continues subsequent to the dressing operation until the cam II elevates the screw I4, thereby shifting the arm I26 still further to v the left into a position for engagement with the the workpiece.
aioaovo of the table travel. The arm I30, is a part of the lever MI and movement of this lever releases the depending arm I33 for again elevating the arm 98 and for shifting the valve I66 to the right. Elevation of the arm 98 causes the table to move to the left to inoperative position and movement of the valve I66 procures a retraction of the crossfeed movement.
From the foregoing it will be apparent that the present invention provides for setting in operation the mechanism which procures the movement of the dressing tool into operativeposition only when the grinding wheel is at the inner end of the workpiece, so that the dressing tool during its movement into operative position will be guided by the same cam whichsubsequently returns the dressing tool to inoperative position. The mechanism which actuates the dressing tool is set in operation by the reversing member through which the table movements are procured,
and is actuated when the reversing member is shifted at one .end of the table movements The same mechanism which procures the movement of the dressing tool at the desired point, also may be used for setting other mechanism in operation when the grinding wheel is at the inner end of Such other mechanism may be the structure by which the back-off oi the grinding wheel is obtained. Where the crossfeed movement is independent of the reciprocations of the table the present invention provides for causing the changes in the grinding operation to take place at one end of the normal reciprocation of the table rather than independently thereof, as would occur if the changes in the grinding operation were under the control of the crossfeed mechanism without any interconnection between the control mechanism and the reversing means for the table movement.
I claim:
1. In a grinding-machine, a grinding member, a work supporting member, a reciprocatory table on which one or said members is mounted for procuring a relative movement therebetween, reversing means for said table, control means for procuring a change in the grinding operation, actuating means for said control means auto- 'matically operative at a predetermined point in tween said actuating means and said reversing means for procuring actuation of said control means by said actuating means only at one end of the table movement.
2. In a grinding machine, a grinding member, a work-supporting member, a reciprocatory table on which one of said members is mounted for procuring a relative movement therebetween, reversing means for said table, controlmeans for procuring a change in the grinding operation, actuating means for said control means automatically operative at a predetermined point in the grinding operation and independently of the position or the table, and means associated with the reversing means and providing a connection between said actuating means and said control means for actuating said control means only in response to movement of said reversing means.
3. In a grinding machine, a grinding member, a work-supporting member, a reciprocatory table on which one of said members is mounted for promovement and actuated by movement of said re-' curing a change in the grinding operation, actuating means associated with said reversingmeans for rendering said control means operative in response to shifting of said reversing means, means for procuring a crossfeed movement between said members, and means under the control of the crossfeed movement for shifting said actuating means into operative position.
4. In a grinding machine, a grinding member, a work-supporting member, a reciprocatory table on which one of said members is mounted for procuring a relative movement therebetween, re-
versing means for said table, control means for procuring a change in the grinding operation, actuating means associated with said reversing means for rendering said control means operative in response to shifting of said reversing means, means independent of the table reciprocations for procuring a crossfeed movement between said members, and means under the control of the crossfeed movement for shifting said actuating means into operative position.
5. In a grinding machine, a grinding member, a work-supporting member, a reciprocatory table on which one of said members is mounted for procuring a relative movement therebetween, re-
versing means for said table, control means forprocuring a change in the grinding operation, means for procuring a crossfeed movement between said members, means responsive to said crossfeed movement for actuating saidcontrol means, and means associated with the reversing .means and providing a connection between said actuating means and said control means whereby 'said actuating means procures actuation of said control means only in response to movement of said reversing means.
6. In a grinding machine, a grinding member, a work-supporting member, a reciprocatory table on which one of said members is mounted for procuring a relative movement therebetween, reversing means for said table, control meansfor procuring a change in the grinding operation, means independent of the table reciprocations for procuring a crossfeed movement between said -members, means responsive to said crossfeed movement for actuating said control means, and means associated with the reversing means and providing a connection between said actuating means and said control means whereby said ac- ,tuatingmeans procures actuation of said control means only in response to movement of said a work-supporting member, a reciprocatory table on which one of said members is mounted for procuring a relative movement therebetween, re-
versing means for said table, control means for procuring a change in the grinding operation, a latch for holding said control means in inoperativeposition, means for procuring a crossfeed movement between said members, and means rendered operative in response to said crossfeed versing means at one end of the table movement for tripping said latchl- 9. Ina grinding machine, a grinding member,
. a work-supporting member, a reciprocatory table on which one of said members is mounted for procuring a relative movement therebetween, reversing means for said table, control means for procuring a change in the grinding operation, a latch for holding said control means in inoperative position, actuating means for said latch carried by said reversing means, and means automatically operative duringthe grinding ope'ration -for shifting the actuating means into latch engaging position.
10. In a grinding'machine, a grinding member, a work-supporting member, a reciprocatory table on which one of said members is mounted for procuring a relative movement therebetween, reversing means for said table, control means for procuring a change in the grinding operation, a'latch for holding said control means in inoperative position, actuating means for said latch carried by said reversing means, means for procuring a crossfeed movement between said members, and means responsive to said crossfeed movement for shifting the actuating means into latch engaging position. v
11. In a grinding machin ,a grinding member, a work-supporting member, a reciprocatory table for one of said members for procuring a relative movement therebetween, a dressing member mounted for movement relative to the grinding member in response to the table mover ment, said dressing member having an inoperative and an operative position in alinement with the position of the grinding member, reversing means for said table, control means for procuring movement of the dressing member into op- I erative position, means for procuring a crossfeed movement between the grinding member and the work-supporting member, means on said reversing means for rendering said control means operative',,and-means responsive to the crossfeed movement for shifting said last means into operative position;
12. In a grinding machine, a grinding member, a dressing member having an inoperative and operative position in alinement with the periphery of the grinding member, a reciprocatory table for one of said members for procuring a relative movement therebetween, reversing means for said table, control means for procuring movement of the dressing member into operative position, a cam in fixed relation to the grinding ,member for moving the dressing member out of operative position, and means on the reversing means for rendering said control means operative to procure movement of the dressing memberinto operative position at one end of the table movement, whereby said cam will guide the dressing member into operative position.
13. In a grinding machine, a grindin .mem-
her, a work-supporting member, a table on which one oii said members is mounted and whose movement procures a relative axial movement between said members, reversing means for reversing the direction of movement of the table, automatic control means for interrupting the normal reciprocatory movements of said table, a latch for normally retaining said control means in an inoperative position, meansfor procuring a crossfeed movement between said members, means on, said reversing means for actuating said latch, and mechanical elements adaptedto be shifted in response to the crossfeed movement for rendering said lastmeans operative.
14. In a'grinding machine, a grinding member, a dressing tool member having an inoperative and an operative'position, a table on which ing said other means operative.
15. In a grinding machine, the combination with a grinding wheel, a dressing tool having an operative and an inoperative position, a table for procuring a relative movement between said parts, means including a reversing member and reversing dogs for reversing the direction of movement oi. said table, cam means for moving the dressing tool out oi operativeposition, actuating means for shifting the tool into operative position, and control means for said actuating means, of means associated with said control means and forming a part of the reversing means to provide for actuation of said control means only atone end of the table movement, said cam being positioned to guide the tool into operative position.
16. In a grinding machine, the combinationwith a grinding member, a work-supporting member, a table on which one of said members is mounted for procuring a relative ,movement therebetween, a dressing tool having an operative and an inoperative position and mounted for movement relative to the grinding member in response to the table movement, means including a reversing member for reversing the direction of movement of said table, cam meansi'or moving the dressing tool out of operative position, actuating means for shifting the tool into operative position, and control means for said actuating means, of means associated with said control meansand forming a part of the reversing means toprovide for actuation of said control means only at one end of the. table movement, and means automatically operative during the grinding operation for rendering said last means operative.
17. In a grinding machine, the combination with a grinding member, a work-supporting member, a table on which one of said members is mounted for procuring a relative movement therebetween, a dressing tool having an opera tive and an inoperative position and mounted for a part of the reversing means to provide for 'actuation of said control means only at one end of the table movement, and means responsive to the crossfeed movement to render said last means operative. I
18. In a grinding machine, a grinding member, a work-supporting member, a reciprocating table on which one of said members'is mounted for procuring a relative movement between said members,reversing means for the table, control means for procuring a radial separation between said members and simultaneously an axial separation therebetween by an extended movement of the table,-actuating means associated with said reversing means for rendering said control means operative in response to shifting of said reversing means, means for procuring a crossi'eed movement between said members, and means responsive to said crossfeed movement for shifting said actuating means into operative position.
ALFRED P. BURNS.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US151885A US2156970A (en) | 1937-07-03 | 1937-07-03 | Grinding machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US151885A US2156970A (en) | 1937-07-03 | 1937-07-03 | Grinding machine |
Publications (1)
Publication Number | Publication Date |
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US2156970A true US2156970A (en) | 1939-05-02 |
Family
ID=22540652
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US151885A Expired - Lifetime US2156970A (en) | 1937-07-03 | 1937-07-03 | Grinding machine |
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US (1) | US2156970A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2445146A (en) * | 1943-01-15 | 1948-07-13 | Ex Cell O Corp | Internal grinding machine |
US2612008A (en) * | 1951-04-10 | 1952-09-30 | Heald Machine Co | Internal grinding machine |
US2662352A (en) * | 1950-02-23 | 1953-12-15 | Rhodes Clement Tipton | Precision grinding machine |
US2740236A (en) * | 1953-07-15 | 1956-04-03 | Norton Co | Grinding machine |
-
1937
- 1937-07-03 US US151885A patent/US2156970A/en not_active Expired - Lifetime
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2445146A (en) * | 1943-01-15 | 1948-07-13 | Ex Cell O Corp | Internal grinding machine |
US2662352A (en) * | 1950-02-23 | 1953-12-15 | Rhodes Clement Tipton | Precision grinding machine |
US2612008A (en) * | 1951-04-10 | 1952-09-30 | Heald Machine Co | Internal grinding machine |
US2740236A (en) * | 1953-07-15 | 1956-04-03 | Norton Co | Grinding machine |
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